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Down Syndrome: Causes, Types and Symptoms - Healthline
Down syndrome (sometimes called Down's syndrome) is a condition in which a child is born with an extra copy of their 21st chromosome (hence its other name, Trisomy 21). This causes physical and mental developmental delays and disabilities.
http://www.healthline.com/health/down-syndrome#Overview1
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Down Syndrome, Topic Overview - WebMD
Down syndrome is a set of physical and mental traits caused by a gene problem that happens before birth.
http://www.webmd.com/children/tc/down-syndrome-topic-overview#1
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Down's Syndrome - NHS Choices
Down's syndrome, also known as Down syndrome, is a genetic condition that typically causes some level of learning disability and characteristic physical features.
http://www.nhs.uk/conditions/Downs-syndrome/Pages/Introduction.aspx
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What Is Down Syndrome? - National Down Syndrome Society
Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21.
http://www.ndss.org/Down-Syndrome/What-Is-Down-Syndrome/
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Down Syndrome - Kid's Health
Down syndrome is a condition in which extra genetic material causes delays in the way a child develops, both physically and mentally.
http://kidshealth.org/en/parents/down-syndrome.html
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Down Syndrome: Symptoms, Causes, Diagnosis and Treatment - WebMD
Down syndrome is a lifelong condition in which a person is born with distinct physical features and some degree of cognitive disability.
http://www.webmd.com/children/tc/down-syndrome-topic-overview
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Down Syndrome: Causes, Types and Symptoms
Down syndrome is the most common genetic condition in the United States. It causes physical and mental developmental delays and disabilities.
http://www.healthline.com/health/down-syndrome
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Down Syndrome - Mayo Clinic
Down syndrome - Comprehensive overview covers causes, risk factors and diagnosis of this genetic disorder.
http://www.mayoclinic.org/diseases-conditions/down-syndrome/basics/definition/con-20020948
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Down Syndrome - March of Dimes
Down syndrome is a chromosomal disorder that causes intellectual disability and other health problems. Get the facts on treatment options for your child.
http://www.marchofdimes.org/complications/down-syndrome.aspx
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Down syndrome Causes - Mayo Clinic
Down syndrome - Comprehensive overview covers causes, risk factors and diagnosis of this genetic disorder.
http://www.mayoclinic.org/diseases-conditions/down-syndrome/basics/causes/con-20020948
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Down Syndrome Information Alliance - DSIA
The Down Syndrome Information Alliance provides support and resources to empower individuals with Down syndrome, their families, and our community.
http://downsyndromeinfo.org
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Down's Syndrome: Signs of Down's Syndrome and Test. - Patient
Down's syndrome is a genetic chromosome problem. Someone with Down's syndrome has an extra copy of chromosome 21 in the cells of their body.
http://patient.info/health/downs-syndrome-leaflet
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Down Syndrome Issues and Information
Down Syndrome Issues and Information is an extensive series of comprehensive reference resources examining issues for people with Down syndrome from birth to adulthood.
https://www.down-syndrome.org/information/
